What Is Inventory?
Inventory is the stock of items a company owns and intends to sell, or uses to make products it will sell. For a retailer, it is mostly merchandise bought ready for resale. For a manufacturer, it usually falls into three groups: raw materials waiting to be used, work-in-process partly built into products, and finished goods ready to ship. Supplies consumed in operations, such as packaging, may also be counted. Because inventory is expected to turn into cash or revenue within a year, it is normally listed as a current asset on the balance sheet.
How Inventory Is Valued
When goods are sold, their cost moves from the balance sheet to cost of goods sold on the income statement. Companies must choose a method for assigning costs to units. Common approaches include first-in, first-out (FIFO), which assumes the oldest items are sold first; last-in, first-out (LIFO), which assumes the newest items are sold first and is not permitted under International Financial Reporting Standards; and weighted average cost, which spreads the cost of all units evenly. Inventory is generally carried at the lower of cost or net realizable value, so a drop in market value is recorded when it happens rather than later.
Why Inventory Matters to Investors
Inventory affects several parts of a company's financial picture. Because it ties up cash, a rise in inventory can mean a business is spending money on goods it has not yet sold. Holding stock also carries costs such as storage, insurance, spoilage, and obsolescence. If inventory grows faster than sales, it may signal weak demand, and the company could later need to discount goods or write them off. Analysts often compare cost of goods sold with average inventory to calculate inventory turnover, a measure of how quickly stock is sold:
Inventory Turnover = Cost of Goods Sold ÷ Average Inventory
Comparing turnover across periods, or against competitors in the same industry, can reveal trends that are not obvious from revenue alone.
Updated October 16, 2026. For general education only; not financial, tax or legal advice.